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3 Sheets-Sheet 1.

(No Model.)

W. P. BREWSTER. RECORDING THERMOMETER.

No. 892,310. Patented Nov. 6, 1888.

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3 SheetsSheet 2.

' (No Model.)

' W. P. BREWSTER.

RECORDING THERMOMETER.

No. 392,310. Patented Nov. 6, 1888.

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(No Model.) 3 Sheets-Sheet 3. W. F. BREWSTER.

RECORDING. THERMOMBTER,

No. 392,810. Patented Nov. 6, 1888.

a vvcmwwof I I jvwowtoz UNITED STATES PATENT @FFIQEO IVILLIAM F.BREWSTER, OF EAST ORANGE, N WV JERSEY.

RECORDENG=THERMOMETER SPECIFICATION forming part of Letters Patent No.392,310, dated November 6, 1888.

Application filed January 11, 1888. Serial No. 260,400.

To all whom, it may concern:

Be it known that I, WILLIAM F. BREWSTER, a citizen of the United States,residing at East Orange, in the county of Essex and State of New Jersey,have invented certain new and useful Improvements inRecoMing-Thermometers, of which the following is a specification.

This invention relates to improvements in what are known asrecording-thermometers-that is, thermometers which make on a sheet ortablet a record of the temperature during a given period of time, sothat they can be adjusted, and during or at the end of any such periodof time the temperature ofanyparticular point of time in such period canbe told at a glance upon the sheet or tablet, and, as usuallyconstructed, such record can be pre served for future reference, if sodesired.

The present improvements consist in certain details of constructionwhereby such thermometers are rendered more certain in operation, moreconvenient in use, defects are remedied, and advantages are obtained,and they relate more particularly to and consist more especially in,first, a holder carrying a marking medinm-such as an inked or carbonizedribbon or sheet-said holder being so constructed and arranged that itisindependent of and does not move with the recording-sheet when thelatter is moved in making a record; second, a movable holder carrying amarking mediumsuch as an inked or carbonized ribbon or sheet-said holderbeing so constructed and arranged that it is independent of and does notmove with the reodrding-shcet when the latter is making a record, andwith the marking medium can be moved away from its position, so that therecordingsheet may be more readily changed or adjusted in position;third, a compound lever for causing the point or stylus (which isbrought into contact with the marking medium and recording-sheet toproduce a record) to move a greater distance in the same space of time,thus striking a quicker blow and lifting more quickly after the blow hasbeen struck, and also enabling the point at which the lever is securedto the frame to be at greater distance from the cam which actuates saidlever, and thus requiring less power for its operation; fourth, aspringbuffer for giving -a quick rebound to the sty- (X0 model.)

Iusarm; fifth, the spring-connection of the stylus-arm to the free endof the bimetallic thermometers, so that the arm will move readily towardand away from the recording-sheet when making a record; sixth, a pivotedrecording-sheetsupporting frame, whereby the frame can be swung up toallow access to the clock mechanism or when placinga new sheet thereon.

In the annexed drawings, Figure l. is a front View with a portion of therecording-sheet broken away to give a better view of the connectionbetween the hammer mechanism and clock-work which moves therecording-sheet. Fig. 2 is a side view; Fig. 3, a detail section on line10 10, Fig. 2; Fig. 4, a detail rear view; Fig. 5, asection on line o r,Fig. 9. Fig. 6 is a side View, and Fig. 7 a top view, of thestrikersprings; Fig. 8, a sectional and side view ofa portion of thedevice; Fig. 9, a side view looking at the inside of the back wall;Figs. 1O, l1, 12, 13, and 14-, modifications.

The letter A represents aportion of the case which is to contain thevarious parts of the mechanism. The back wall, a, is preferably ametallic plate,upon which the various parts of the mechanism arefastened. In the walla of the case is out a hole, a in which iscountersunk the flanged end I) of a post, B, by

means of screws 1), Fig. l. Projecting rearwardly from this post 13 isthe bracket G,hav ing the vertical arm 0. To this arm 0 is socured oneend, (Z, of a bimetallic helical thermometer, D, the other end, 0, ofwhich is connected to a shaft, (2 which passes through the post B andcarries on its projecting end (P the arm E,having thelower shorterweighted portion, 6, and thenpper longer portion, 6. To the top of thisarm, on the under side, is secured apin or stylus, e",and to this top isalso secured afinger, e, which projects up beyond the end of the upperlonger portion, 0, and serves as a pointer or indicator; or the finger emay be omitted.

In the drawings I have shown the arm E as being connected to the shaftd" at a right angle thereto, which I consider the preferred form; but itwill be manifest to any mechanic that the arm might be connected to theshaft at an angle other than a right angle and yet have it serve itspurpose.

To the rear side of the arm E there is rigidly secured the upper end, f,of a spring, F, the lower end, f, of which bears loosely against a stud,f upon a sleeve, f which is keyed to the shaft (Z between the arm E anthe post B.

Secured to the wall a back of the arm E is the recording mechanism, theclock portion G of which is of the ordinary construction, and whichcarries the operative cam-wheel II. This canrwheel H has the fourcam-sur faces 9, such surfaces being given acurvature which makes themquick cams, so as to quickly lift the lever II and form a crown-wheelwith camteeth. Below the clock mechanism a post, it, projecting from thewall a, has pivoted to it the lever H, which is one portion of the compound lever. This lever has the stem h, the cross-bar h, finger h andtop arm, h", provided with the vertical slot it", the finger h"projecting across the face of the cam-wheel II and in the path of theseveral cam surfaces or teeth.

Secured to the wall a is a bracket, t, and to the frame of the clockmechanism another bracket, t. To these brackets is secured a rod Z onwhich are hinged the arms i '17, one at each end of the rod '5 and across bar, i, connecting the free ends of the arms, forming the hammeror striker I. The lever H and the hammer on striker I form a compoundlever. This cross-bar has a sharp edge, L and the hammer or striker isso arranged on the rod 4" that the striker is on the side of I the armand stylus away from the recording sheet. A. pin, 2', enters the sloth". Surrounding the rod Z is a spiral spring, k, one end of which bearson the striker or hammer I and the other end against the bracket Z. Thisspringis arranged so that its free resilient action will throw thestriker I against the arm E. To the clock-frame there is secured aspiral or other buffer-spring, K, just back of the lever H.

To one side of the wall a there is secured a stud or arbor, on which ispivoted a frame,L, which carries the recording-sheet support M and thegear-wheel Z, which drives it. This gear-wheel Z meshes with the gearedpinion Z of the clock mechanism. This frame L has a portion, Z", whichlies next to the plate a, which plate has a bar, Z, attached to it, sothat the portion of the frame Z can move up and down between the plate aand bar Z. The end of Z extends beyond Z and is provided with aspring-catch, Z which engages with a hole, Z, or with the top of thewall a, as the frame is either up or down. A stud, Z limits the upwardmovement of the frame L; also, to hold the frame L more rigidly in placewhen the gear-whecl Z is connected with geared pinion Z the slot Z fitsclosely around and under the head of stud-screw Z. The recording-sheetsupport M has the usual recording-sheet, N. The support M has asmooth-bored hub, m, through which projects the end of arbor Z, witheatches,m.

hub resting against a shoulder, m, the outer Z screwing into thumb-nutN,Fig. 1. Hinged to edge of support M are several spring- Therecording-sheet N is centered around the end of arbor Z and snappedunder spring-catchesm. The binding-disk n is placed over paperrecording-sheet N,and the thumbnut N, being screwed down, binds thepaper recording-sheet N to its support M, and the pressure of thnmbnut Nfirmly holds the sup port M and recording-sheet N from turning on arborZ, because the hub m is bound against shoulder of arbor m".

Projecting at right angles from wall-plate a on theleft-hand side ofsupport M and nearly opposite to its axis is the'hollow bored postO,through which passes the shaft 0 from IV to WV, Fig. 2. The shaft 0 isshouldered on the post 0 at 0", and is on the extreme outer end keyed tothe crank-lever X by a setscrew, m. At the other inner end of the shaft0 is hinged a holder or bridge, P, by a knife-blade spring-joint, 0.This holder consists of a horizontal bar, with two vertical ends, pp',having cars 11 1)". Through these cars p r pass the ribbon or sheetholding bobbins QQ, having the usual tension-springs, q q. On thesebobbins is held the inked or carbon ribbon or sheet R, which is fed, asoccasion requires, from one to the other, forming what I have termed amarking medium. The holder is so arranged that the marking medium It isheld underneath the stylus c" of arm E and between the stylus e and therecording-sheet N. This recording-sheetN is subdivided with radial linesdenoting divisions of time and concentric lines denoting degrees oftemperature.

To enable the face of the recordingsheet to be exposed, so that thestylus c of arm E may be set at the proper hour, the holder P has a dualvmovementa motion parallel with the plane of the reeordingsheet, whichenables the rib bon or sheet R to move from under the stylus e and clearof end of arm E, and a movement parallel to the axis of therecording-sheet, (on theknife-bladejoinh) which throws the holder Pentirely clear of recording -sheet N, and leaves it parallel with theshaft 0 and post 0. The movement parallel to the plane of therecordingsheet is obtained by the shaft 0 revolving in post 0, and thismovementislimited to clearing the arm E by the crank-lever X strikingagainst the stud-screws 0c 2:", Fig. 4-, the spring :0 holding theholder P in place under stylus 6 when the instrument is in operation. Toremove holder P from contact with reeordingsheet N, first swing therighthand end of holder P till it clears stylus e or pointer e of arm E,and then lift the end of the holder P until the knife-blade joint holdsit parallel with shaft 0 and at right angles with plane ofrecording-sheet N. To replace the holder P and marking medium E again inposition, reverse the dual motion. lVhen across the face ofrecording-sheet N, the knife-blade spring-joint 0 will hold the holderin one position as the spring x does in the other. On the holder 1? is athermometric scale, S, the same being identical with that which is onthe recording-sheet just underneath the scale.

The object of scale S is, first, to adjust the arm E so that it willindicate and register the proper temperature, and, second, beingcorrectly adjusted, the temperature being at any time registered underthe marking medium It by the stylus e on recording-sheet N can be readby the degree indicated on the scale Shy the finger or pointer e".

In Figs. 10 and 11 is shown a modification of my recording thermometers,in which a thermostatic strip is used instead of the helicalthermometer. A thermostatic strip, Y, is secured at one end in thebindingpost Fig. 10, which post y* is secured to the back of wallplatea. The free end of strip 9 has a pin, 1, which enters slot 12 of thelever V, the other slotted arm, 0, in which enters a crank-pin, t, ofthe crank T, which is secured to the shaft d by the set screw T Figs. 10and 12. Both the pin gf" and the crank-pin if (as to the width of theslots) accurately fit said slots in lever V. As the thermostatic strip Yis affected by the change in temperature, it moves to the right or leftfrom a straight position, and the pin y'fithrough the lever V,causes theshaft (1' to move the arm E across the face of the recording-sheet N inthe same manner as by means of the helical thermometer.

The object of the slot is twofold: First, it provides for the shorteningor lengthening of the thermostatic strip Y as it curls from or returnsto a straight position, and, second, the crank-pin t being adjustable asto its distance from the axis of d by the set-nut t the slot 1 providesfor this change in leverage of crank T, as the slot 1) provides for thechange in the lengthening and shortening of strip Y. The

change in the distance of the pin i from the axis of crank T is toprovide a means of changing the range indicated on the scale S andrecorded on the recordingsheet N, as is hereinafter described.

In Figs. 12 and 13 is shown another modification. Here the compensatinglever-Visdis pensed with, and the crank-pin if, instead of entering theslot in slotted arm 12 of lever V, enters a slot made at the end of thestrip Y at the point where the pin y" is placed in the modificationillustrated in Figs. 10 and 11, the result (the turning of the crank Tby means of the strip Y) being the same in both modifications.

In set screw (2" in Fig. 2 and T- in Figs. 10 and 12 a means for settingthe arm E is provided, so that the stylus 6 may record on recordingsheetand finger 6 may indicate on scale S the correct temperature.

The clock mechanism is wound up, and to wind the top spring therecording-sheet support M is thrown up out of the way, so as to giveaccess to the upper winding-post. The holder P is placed across therecording-sheet, as heretofore described, and with the marking mediumbetween the stylus and the re cording-sheet, with the ribbon It properlyinked or carbonized. The whole device is dulyincascd in a suitable caseand put in place with the thermometer projecting within the space thetemperature of which is to be recorded. As the thermometer varies in itsexpansion and contraction, so the arm E will be swung to the right orthe left. Meanwhile the clock mechanism, unwinding, turns the camwheelG, so that the cam-surfaces 9, bearing against the finger 7L3, move thestriker or hammer I on the rod Z away from the arm, the slot h allowingfor the necessary play. This movement compresses the spring 7.. As soonas a given surface, 9, passes the finger It", the spring 7v quicklythrows the striker or hammer against the arm E, causing the stylus c tostrike the marking medium,R-,and mark the recording-sheet N. The shockupon thepoint-er is taken up by the spring F, and the stroke of thestriker or hammer I and the lever H is taken up by the buffcrspring K.The camwheel making one revolution per hour and there being fourcam-surfaces, the arm strikes the marking medium once every quarter ofthe hour and the recordingsheet only moves after each stroke asufficient distance to allow of another stroke. Hence the points madeupon the recording sheet appear as a continuous line.

To adjust the arm E so that when operated by the helical thermometer Dit shall indicate and record the correct temperature, loosen set-screw din arm 0, so that shaft (1 is free to revolve; then, having moved thefinger (f of arm E so that it points to same degree on scale S as shallbe at the time indicated on a standardized thermometer by which theadjustment is made,while retaining the finger or pointer 6 so it pointsto the correct degree of temper ature, (as indicated on a standardizedthermometer,) fasten the shaft (1* in arm 0 by screwing down theset-screw (P.

To adjust the arm E when operated by the thermostatic strip Y, loosenthe setserew T in the crank T until the shaft (1 is free; then, havingset the finger c on arm E on scale by a standardized thermometer, holdthe arm at the then correct temperature and fasten the crank T on shaftd by screwing down the setscrew T being careful to let the position ofthe crank T on shaft (Z be that which the free action of strip Y hasgiven it.

To change the range of the arm so that the number of degrees indicatedon the scale S and recording-sheet N may be greater or less, loosen thenut t on lower end of crank-pin 2?, so that it will slide in crankslot'6. To increase the rauge, move the pin t away from axis of (P, and therange can be decreased and the arm E made to move a greater distanceorgreater part ofacircle to each degree of temperature by moving thepint nearer to the axis of (I -that is, the radial lines in drawingsrepresent one-twentieth of a circle and the range of the scale indrawings is 60 Fahrenheit.

I have herein shown and described my improvements as applied to arecording-thermometer of the preferred form or construction; but it ismanifest that they could as readily be applied to other forms orconstrue tions than the one here selected. It is also manifest to anymechanic that the form or construction of the holder P and markingmedium R, as well as that of the compound lever I, could be somewhatchanged and yet have the holder P, medium 1?, and compound lever Iperform the same functions in the combina tion of parts hereinafterclaimed as the special form or construction herein shown and described.Therefore Ido not wish to limit my selfto the exact form or constructionherein shown and described; but

\Vhat I claim,and desire to secure by Letters Patent, is-

1. In a recordingthermometer, the combination, substantially as setforth, of a recording-sheet, a mechanism for moving the same, abimetallic thermometer with its free end connected to an arm, a styluson said arm, a holder independent of the recording-sheet, a markingmedium mounted on said holder and disposed between the recording-sheetand stylus, and a hammer connected with the mechanism for moving therecording-sheet, and arranged to strike the stylus against the markingmedium and recording-sheet at stated intervals of time,whereby therecording-sheet will be caused to move and receive upon it marks made bythe marking mechanism and stylus when the latter is forced against saidsheet by the action of the hammer, and thus make a record of thetemperature during a given period of time.

2. In a recordingthermometer, the combination, substantially as setforth, .of a recording-sheet, a mechanism for moving the same, abimetallic thermometer, a shaft connected with the free end of saidthermometer and thereby rotated, an arm secured at an angle to saidshaft and provided with a stylus, a holder independent of therecordingsheet, a marking medium mounted on said holder and disposedbetween the recordingsheet and the stylus, and a hammer connected withthe mechanism for moving the recording-sheet, and arranged to strike thestylus against the marking medium and recording-sheet at statedintervals of time, whereby the recordingsheet will be caused to move andreceive upon it marks made by the marking medium and stylus when thelatter is forced against said sheet by'the action of the hammer, andthus make a record of the temperature during a given period of time.

3. In a recording-thermometer, the combination, substantially as setforth, of a recording-sheet, a mechanism for moving the same, abimetallic thermometer with its free end connected to an arm, a styluson said arm, a movable holder independent of the record ing'sheet, amarking medium mounted on said holder and disposed between therecordingsheet and the stylus, and a hammer connected with the mechanismfor moving the recording sheet, and arranged to strike the stylusagainst the marking medium and recordingsheet at stated intervals oftime, whereby the said holder can be moved from between therecording-sheet and stylus or away from said rccording-sheet when it isto be changed, and also return to its position for making a record.

4. In a recordingthermometer, the combination, substantially as setforth, of a recording-sheet, a mechanism for moving the same, abimetallic thermometer with its free end connected to an arm, astylus onsaid arm, a holder independent of the recording-sheet and carrying amarking medium, the medium being disposed between the recordingsheet andstylus, and a compound lever constructed substantially as described andconnected to the mechanism for moving the recording sheet, whereby thestylus will be forced against themarking medium and recordingsheet witha quick blow, and the stylus will be quickly relieved from the pressureof the hammer portion of said lever, and the stylus be left free to bemoved by the bimetallic thermometer, and aclearer and more nearlycorrect record be made.

5. In a recording-thermometer, the combination, substantially as setforth, of a recording-sheet, a mechanism for moving the same, abimetallic thermometer with its free end connected to an arm, a styluson said arm, amovable holder independent of the recordingsheet, saidholder moving on a knife-blade spring-joint, a marking medium mounted onsaid holder and disposed between the recording-sheet and the stylus, anda hammer connected with the mechanism for moving the recordingsheet, andarranged to strike the stylus against the marking medium andrecording-sheet at stated intervals of time, whereby the said holder canbe moved from between the recording-sheet and stylus or away from saidrecording-sheet when it is to be changed,and also return toits positionfor making a record,and when so moved saidholder will be held in eitheroftwo positions by the ac tion of the knifehlade spring-joint.

6. In a recording-13hermometer, the combination, substantially as setforth, of a recording-sheet,a support for such sheet, mechanism formoving the recordingsheet to make a rec ord, and a movable connectionbetween the recordingsheet support and the mechanism for moving therecording-sheet to make a record, whereby the recording-sheet, with itssupport, can be moved to connect or disconiio nect the recording-sheetsupport to or from the as described and connected to the mechanismmechanism for moving the recording-sheet. for moving therecording-sheet, and a buffer- 7. In a recording-thermometer, thecombispring, whereby the compound lever is more nation, substantially asset forth, of a recordquickly moved away from the arm connected 15 5 ingsheet, a mechanism for movingthe same, a to the bimetallic thermometerand a more perbimetallic thermometer with its free end confeet record ismade.

nected to an arm, a stylus on said arm a T w T n holder independent ofthe recording-sheet a nd ILLIAM SLER' carrying amarking medium,themedium being \Vitnesses: IO disposed between the recording-sheetand sty-1 Lotus LAFRANOE,

lus,acomponnd lever constructedsubstantially HENRY T. GRAY.

